A patient suddenly becomes pale and sweaty after an injection of 4ml of lidocaine 2% with epinephrine l:l00,000. The radial pulse is slow and steady. The respiration is slow. The blood pressure is 80/60. What is the most probable diagnosis?

Incipient syncope.

An impending adrenal insufficiency.

An allergic reaction to the local anesthetic.

A toxic reaction to epinephrine.

A toxic reaction to lidocaine.